In the new S31 trailer, there's a dark-colored ship docked at the
Baraam station which I believe belongs to Phillipa Georgiou. The positioning of the staggered box-shaped objects in the outline of the MSD seems to fit with this ship's overall look with the carapace superstructures attached to the hull. It somewhat resembles a distinctly
Defiant-like "armored turtle" design without the front nose piece. Since S31 seems to take place in the early 24th century "lost era", with the existence of a young, pre-"Yesterday's Enterprise" Rachel Garrett in the cast (that's where the Guardian of Forever dropped Georgiou off from DSC), this may be a direct precursor to the
Defiant's design in the late-24th, given to the shipbuilders by S31 to fight the Borg.
Looks like a possible match, anyways...

Here's a close-up of the front of the exterior bridge area. Definitely a tight, compact design. Difficult to read overall details:

This shows
two nav deflectors which appear to be inline with the ship’s bussards and warp coils, which also syncs with the MSD.